Application Scenario
Automotive PKE / PEPS 125kHz LF Antenna Selection Guide
125kHz LF antennas around the vehicle body are critical for robust PKE / PEPS systems.
Improper LF antenna placement, orientation or Q-factor leads to blind spots and unreliable key detection.
Typical project questions
Map your coverage goal, layout and constraints before comparing parameters.
- Typical locations: door handles, trunk, hood and in-cabin LF coverage
- Key parameters: inductance, Q-factor, sensing distance and available space
- Popular products: PREMO 3DC11LP 3D coils and KGEA LF body antennas
Role of LF antennas in PKE/PEPS
- Tx LF antennas create a near-field magnetic field around the vehicle.
- Key fob / receiver uses the field for wake-up and zone recognition before RF steps.
- Results depend on antenna specs, installation, vehicle metal structure, driver and receiver sensitivity.
What to confirm before selection
- Working frequency
- Inductance / Q-factor / DCR
- Size constraint and mounting location
- Target wake-up distance and zone boundary
- Driver circuit and harness routing
- Temperature and reliability requirements
- Prototype quantity and volume plan
- Replacement needs (EOL / legacy BOM)
Recommended directions
A. 125kHz / 134.2kHz Tx LF antennas
For door handles, in-cabin zones, trunk/tailgate and localized LF wake-up coverage.
B. 3D coils / tri-axis sensing
For orientation-insensitive sensing, tri-axis response and evaluation under varying key poses.
C. Replacement & non-standard matching
For EOL parts, legacy BOM constraints, or when you only have size/inductance/frequency requirements.
How Xinri Electronics can help
- Filter candidate parts by placement and frequency range
- Confirm datasheets, dimensions and sample availability
- Support replacement evaluation for legacy parts
- Align sample / pilot / mass-production path based on stock and lead time
Next step
Share your placement, boundary goal and constraints. We will propose a practical evaluation approach.